<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        
        li {
            list-style-type: none;
        }
        
        .box {
            width: 250px;
            margin: 100px auto;
        }
        
        .box li {
            float: left;
            width: 24px;
            height: 24px;
            background-color: pink;
            margin: 15px;
            background: url(images/sprite.png) no-repeat;
        }
    </style>
</head>
<body>
    <div class="box">
        <ul>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li> 
            <li></li>
            <li></li>
            <li></li>
        </ul>
    </div>

    <script>
        var lis = document.getElementsByTagName('li');
        for (var i = 0; i < lis.length; i++) {
            var temp = lis[i];
            temp.style.backgroundImage = 'url('+ '../images/sprite.png' +')';
            var offsetY = 44 * i;
            temp.style.backgroundPosition = '0 -' + offsetY + 'px';
        }
    </script>
</body>
</html>
